mutt-wizard/mailcap

text/plain; vim %s ;
text/html; openfile %s ;
text/html; w3m -I %{charset} -T text/html; copiousoutput;
image/*; muttimage %s ; copiousoutput
video/*; setsid mpv --quiet %s &; copiousoutput
application/pdf; openfile %s ;
application/pgp-encrypted; gpg -d '%s'; copiousoutput;